Edit in JSFiddle

function SpeedmonitorController($scope) {
    
    // The current url we're preparing to add.
    $scope.currentUrl = "";
    
    // In this array, we'll keep track of the urls and their last fetch time.
    $scope.urls = [{url: "www.google.com", loadSpeed:  50},
                {url: "angularjs.org", loadSpeed: 75}, 
                {url: "www.dwmkerr.com", loadSpeed: 120}];
    
    // Adds an url.
    $scope.addUrl = function() {
        $scope.urls.push({url: $scope.currentUrl, loadSpeed: Math.random() * 75 + 50});
    };
    
    // Remove an url.
    $scope.removeUrl = function(index) {
        $scope.urls.splice(index, 1);
    };
}